Class LookAheadIteration<E,X extends java.lang.Exception>
- java.lang.Object
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- org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration<E,X>
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- org.eclipse.rdf4j.common.iteration.LookAheadIteration<E,X>
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- All Implemented Interfaces:
java.lang.AutoCloseable
,CloseableIteration<E,X>
,Iteration<E,X>
- Direct Known Subclasses:
BottomUpJoinIterator
,CrossProductIteration
,DescribeIteration
,DistinctModelReducingUnionIteration
,HashJoinIteration
,JoinExecutorBase
,JoinIterator
,LeftJoinIterator
,MemTripleIterator
,MultiProjectionIterator
,PathIteration
,QueueIteration
,SPARQLCrossProductIteration
,UnionIteration
,ZeroLengthPathIteration
@Deprecated(since="4.1.0") public abstract class LookAheadIteration<E,X extends java.lang.Exception> extends AbstractCloseableIteration<E,X>
Deprecated.An Iteration that looks one element ahead, if necessary, to handle calls tohasNext()
. This is a convenient super class for Iterations that have no easy way to tell if there are any more results, but still should implement the java.util.Iteration interface.
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Field Summary
Fields Modifier and Type Field Description private E
nextElement
Deprecated.
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Constructor Summary
Constructors Modifier Constructor Description protected
LookAheadIteration()
Deprecated.
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Deprecated Methods Modifier and Type Method Description protected abstract E
getNextElement()
Deprecated.Gets the next element.protected void
handleClose()
Deprecated.Called byAbstractCloseableIteration.close()
when it is called for the first time.boolean
hasNext()
Deprecated.Returns true if the iteration has more elements.private E
lookAhead()
Deprecated.Fetches the next element if it hasn't been fetched yet and stores it innextElement
.E
next()
Deprecated.Returns the next element in the iteration.void
remove()
Deprecated.Throws anUnsupportedOperationException
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Methods inherited from class org.eclipse.rdf4j.common.iteration.AbstractCloseableIteration
close, isClosed
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.eclipse.rdf4j.common.iteration.CloseableIteration
stream
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Field Detail
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nextElement
private E nextElement
Deprecated.
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Method Detail
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getNextElement
protected abstract E getNextElement() throws X extends java.lang.Exception
Deprecated.Gets the next element. Subclasses should implement this method so that it returns the next element.- Returns:
- The next element, or null if no more elements are available.
- Throws:
X extends java.lang.Exception
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hasNext
public final boolean hasNext() throws X extends java.lang.Exception
Deprecated.Description copied from interface:Iteration
Returns true if the iteration has more elements. (In other words, returns true ifIteration.next()
would return an element rather than throwing a NoSuchElementException.)
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next
public final E next() throws X extends java.lang.Exception
Deprecated.Description copied from interface:Iteration
Returns the next element in the iteration.- Returns:
- the next element in the iteration.
- Throws:
X extends java.lang.Exception
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lookAhead
private E lookAhead() throws X extends java.lang.Exception
Deprecated.Fetches the next element if it hasn't been fetched yet and stores it innextElement
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remove
public void remove()
Deprecated.Throws anUnsupportedOperationException
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handleClose
protected void handleClose() throws X extends java.lang.Exception
Deprecated.Description copied from class:AbstractCloseableIteration
Called byAbstractCloseableIteration.close()
when it is called for the first time. This method is only called once on each iteration. By default, this method does nothing.- Overrides:
handleClose
in classAbstractCloseableIteration<E,X extends java.lang.Exception>
- Throws:
X
X extends java.lang.Exception
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